JP2005216833A - Decorative molding body and manufacturing method of decorative molding body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain decorative molding bodies having innovative color tones different from a mono-color luster metal tone, especially, a decorated keytop for a push-button switch among the above. <P>SOLUTION: A decorative layer 7 laminating a first metal layer 7a with a visible light reflection rate of 55% to 90%, a transparent resin layer 7b with a thickness of 2,400 nm to 4,800 nm, and a second metal layer 7c with a visible light reflection rate of 55% to 100% in that order from a visible side is provided at the molding body 5, especially, at the keytop 5 for a push-button switch. With this, a phase differential is generated between light reflected at the first metal layer 7a and light reflected at the second metal layer 7c transmitting the first metal layer 7a and the transparent resin layer 7b to be visualized, and a metallic color tone having both mirror surface feeling and iris color can be obtained. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a decorative molded body used for a mobile phone, a portable information terminal, a remote controller for various home appliances, a card remote controller and various keyboards, a housing of an electronic device, and the like, and among them, particularly for a push button switch. Regarding key tops.

  In recent years, electronic devices have been diversified in design along with multifunctionalization. In particular, the cellular phone 1 shown in FIG. 17 that has been popularized not only for business use but also for personal use is not only multi-functionalized with various functions such as a call function, a mail function, and a photographing function, but also other functions. The diversification of the design to differentiate from the model progresses, and competition for new product development is intense from the viewpoint of diversification of the design.

  Among them, the push button switch key top 2 (hereinafter referred to as “key top 2”) that forms a part of the surface of the mobile phone 1 also has a design competition for differentiating from other models. Yes. And the recent key top 2 design tends to favor metal, pearl, and light-colored colors that match the various colored housings 1a. A decorative layer having such a color tone is formed on the surface of the key top body using the surface.

  The decoration layer can be formed by, for example, applying a paint containing metal powder to the surface of the key top 2 by screen printing or spray coating, or applying a metal layer such as nickel or chromium by wet plating by an electroless method or an electrolytic method. A method of providing (see Patent Document 1), a method of providing a metal layer such as aluminum or chromium on the surface of the key top 2 by dry plating such as vacuum deposition or sputtering (see Patent Document 2), and the like are known. .

  Then, by applying these methods, for example, by wet plating or dry plating, the key top is mirror-like, that is, a glossy metallic decoration is applied, and a colored transparent resin layer is formed on the surface of these layers. In order to meet the diversification of designs, a decorative layer with a color tone that should be called a color glossy metal tone is added to the glossy metal tone.

JP 2003-77358 A JP 07-245190 A

  However, it is difficult to obtain a mirror-like metallic tone by applying a paint containing metal powder, and in a method of decorating by dry plating or wet plating, a mirror-like metallic tone can be obtained. However, only a single color tone was obtained. Further, even when a colored transparent resin layer having various colors is further formed on the surface of the plating layer, only a color tone exhibiting a single color glossy metallic tone has been obtained.

  Accordingly, the present invention has been made for the purpose of obtaining a key top having a novel color tone in order to give a further improved design.

  The problem of diversification of the design is that not only the key top 2 constituting the appearance of the mobile phone 1 but also the logo type and model name of the company name are displayed and pasted to the casing as an exterior member of the electronic device. Various molded products that appear on the outside of the product and are subject to design, such as badge-shaped decorative resin molded products and resin casings that form the outer frame of electronic devices, that is, molding that requires decoration Since it is a problem that also occurs with the body, it is possible to obtain a molded body (hereinafter referred to as a “decorated molded body”) that has been decorated with a novel color tone in order to give further improved design. It is the purpose.

  In the present invention, the first metal layer having a visible light reflectance of 55% to 90%, the transparent resin layer having a layer thickness of 2400 nm to 4800 nm, and the second having a visible light reflectance of 55% to 100% from the viewing side. A decorative molded body comprising a decorative layer laminated on a molded body in the order of a metal layer is provided.

  From the side to be viewed, a first metal layer having a visible light reflectance of 55% to 90%, a transparent resin layer having a layer thickness of 2400 nm to 4800 nm, and a second metal layer having a visible light reflectance of 55% to 100% in this order. Since it has a decorative layer laminated on the molded body, the phase difference between the light reflected by the first metal layer and the light reflected by the second metal layer through the first metal layer and the transparent resin layer Is generated and visually recognized. Therefore, it becomes a decorative molded body having a metallic color tone having both a specular feeling and an iris color, and a decorative molded body excellent in design can be obtained.

  This decorating layer can be formed on the front surface, back surface or inside of the molded body. The location where the decorative layer is provided can be freely selected depending on the desired conditions, such as the manufacturing process and design requirements, and therefore the inconvenience such as limited use of the decorative molded body due to the limited formation location of the decorative layer There is no material and easy to handle. However, when providing a decoration layer in the back surface and the inside of a molded object, since a decoration layer is visually recognized through a molded object, it is necessary to use a highly transparent molded object.

  Moreover, this invention can be set as the decoration molded object by which the display layer which forms the display part which represents a character, a symbol, etc. is formed as a layer different from the said decoration layer. Since the display layer that forms the display unit for displaying characters and symbols is formed as a layer separate from the decorative layer, the background portion of the characters and symbols is a metallic tone that combines specularity and iris color. It is possible to obtain a decorative molded body having a color tone, and conversely, it is possible to obtain a color tone in which the iris color is expressed in portions such as letters and symbols, and a decorative molded body excellent in design can be obtained.

  It can be set as the decorating molded object which forms the display part which exposes a character, a symbol, etc. in the site | part in which the decorating layer was provided, or the site | part in which the decorating layer is not provided. Since the display part which expresses a character, a symbol, etc. is formed in the part provided with the decoration layer or the part where the decoration layer is not provided, the display part which expresses the character, the symbol, and the like The surroundings can be distinguished by the presence or absence of an iris color, and a decorative molded body excellent in design can be obtained.

  And the transparent resin layer which comprises a decoration layer can be formed with a thermoplastic resin. If the transparent resin layer is composed of a thermoplastic resin, the transparent resin layer functions as an adhesive layer between the first metal layer and the second metal layer, and the first metal layer and the second metal layer are connected via the transparent resin layer. Since it is possible to heat laminate, the decoration layer can be easily formed. Further, the thickness of the transparent resin layer can be easily controlled, and a decorative molded body having an iris color having a desired color tone can be obtained with a high yield. Therefore, it can be set as an inexpensive decorative molded body.

  Moreover, a molded object can be used as the key top for pushbutton switches. By using the molded body as a key top for a push button switch, it is possible to provide a key top for a push button switch having a metallic color tone having both a specular feeling and an iris color.

  Furthermore, in the present invention, a first transfer layer formed by sandwiching a first metal layer having a visible light reflectance of 55% to 90% between resin layers is transferred onto the back surface of a transparent molded body, and visible light reflection is performed thereon. A second transfer layer in which a second metal layer having a rate of 55% to 100% is sandwiched between resin layers is transferred, and a transparent layer having a thickness of 2400 nm to 4800 nm is provided between the first metal layer and the second metal layer. Provided is a method for producing a decorative molded body provided with a decorative layer comprising a first metal layer, a transparent resin layer, and a second metal layer, wherein a resin layer is formed.

  A first transfer layer in which a first metal layer having a visible light reflectance of 55% to 90% is sandwiched between resin layers is transferred to the back surface of the transparent molded body, and the visible light reflectance is 55% to Since the second transfer layer formed by sandwiching the 100% second metal layer between the resin layers was transferred, a transparent resin layer having a layer thickness of 2400 nm to 4800 nm was formed between the first metal layer and the second metal layer. A decorative layer having a metallic color tone having both a mirror finish and an iris color can be formed on the back surface of the molded product, and a decorative molded product having an excellent design can be obtained. In addition, since the first transfer layer and the second transfer layer are transferred twice, a transparent resin layer can be easily obtained by using two types of transfer layers prepared in advance so that the layer thicknesses are different. The decoration layer which changed layer thickness of can be obtained. Therefore, it is possible to easily manufacture several types of decorative molded bodies that express iris colors having different main hues.

  Furthermore, the present invention transfers a second transfer layer formed by sandwiching a second metal layer having a visible light reflectance of 55% to 100% between resin layers to the surface of the molded body, and then a visible light reflectance. A transparent resin having a layer thickness of 2400 nm to 4800 nm between the first metal layer and the second metal layer by transferring a first transfer layer in which a first metal layer of 55% to 90% is sandwiched between resin layers Provided is a method for producing a decorative molded body provided with a decorative layer comprising a first metal layer, a transparent resin layer, and a second metal layer.

  A second transfer layer in which a second metal layer having a visible light reflectance of 55% to 100% is sandwiched between resin layers is transferred to the surface of the molded body, and the visible light reflectance is 55% to 90%. The first transfer layer comprising the first metal layer sandwiched between the resin layers was transferred to form a transparent resin layer having a layer thickness of 2400 nm to 4800 nm between the first metal layer and the second metal layer. A decorative layer having a metallic tone having both a feeling and an iris color can be formed on the surface of the molded body, and a decorated molded body having an excellent design can be obtained. In addition, since the first transfer layer and the second transfer layer are transferred twice, a transparent resin layer can be easily obtained by using two types of transfer layers prepared in advance so that the layer thicknesses are different. The decoration layer which changed layer thickness of can be obtained. Therefore, it is possible to easily manufacture several types of decorative molded bodies that express iris colors having different main hues.

  And the said manufacturing method is applicable by making a molded object into a key top for pushbutton switches. By using the molded body as a key top for a push button switch, it is possible to obtain a key top for a push button switch having a metallic color tone having both a specular feeling and an iris color.

  According to the decorative molded body of the present invention, it is a decorative molded body with a completely new design that has both a specular glossy metallic tone and an iris color, and a personal use with a high demand for a variety of designs It can be particularly suitably used as a material for the direction.

  Moreover, according to the method for producing a decorative molded body of the present invention, it is possible to easily obtain a decorative molded body having a color tone excellent in a completely new design having both a glossy metallic tone having a specular feeling and an iris color.

  As an embodiment of the decorative molded body of the present invention, a “key top” used in a mobile phone 1 will be described with reference to the drawings. In the attached drawings, the thicknesses and lengths of the constituent members may differ from the actual scales for convenience of explanation and ease of viewing. In addition, redundant description of the configuration common to the prior art and the configuration common to the embodiments is omitted.

First Embodiment FIG. 1 is an external plan view of a key sheet 3 as a cover member for a push button switch used in the mobile phone 1, and FIG. 2 is a sectional view taken along line SA-SA in FIG. The key sheet 3 has a structure in which a key top 2 that displays characters and symbols and receives a pressure by a finger or the like, and a base sheet 4 made of a rubber-like elastic body such as silicone rubber are fixed by an adhesive 4a. is there. When the key top 3 is pressed with a finger, the key sheet 3 elastically deforms the base sheet 4 and presses a metal disc spring (not shown) arranged in the pressing operation direction to fix a fixed contact ( (Not shown) becomes conductive.

  The configuration of the key top 2 of the present invention that constitutes a part of the key sheet 3 will be described in more detail. A display portion 6a for displaying characters and symbols is provided on the back surface 5a of the key top body 5 made of a hard resin molded body. The display layer 6 is provided, and a decorative layer 7 having a metallic color tone having both a specular feeling and an iris color is provided on the back side thereof as a separate layer from the display layer 6.

  The key top body 5 is made of a thermoplastic resin such as polycarbonate or acrylic, a hard resin such as a thermosetting resin such as epoxy or silicone, or a rubber-like elastic body such as silicone rubber in some cases, and is used for injection molding or casting. It is a molded object obtained by methods such as. However, these resins and the like need to use a highly translucent material when the decorative layer 7 is formed on the back surface. In order to see the key top 2 from the surface side of the key top 2, that is, the side on which the key top 2 is viewed is the upper surface side of the key top 2, so that the decorative layer is visually recognized unless the key top 2 is highly transparent. Because you can't.

  The display layer 6 is a layer formed by a character layer 6b serving as a display unit 6a representing characters and symbols, and a blank character layer 6c formed around the character layer 6b. The character layer 6b and the extracted character layer 6c can be formed by, for example, screen printing or pad printing.

  The decorative layer 7 is a layer having a laminated structure in which the first metal layer 7a, the transparent resin layer 7b, and the second metal layer 7c are laminated in this order from the side to be viewed.

  The first metal layer 7a is a metal layer having a visible light reflectance of 55% to 90%, preferably 70% to 80%, and is formed by dry plating such as vacuum deposition, ion plating, and sputtering. A layer is preferred. The reason why the metal layer is preferably formed by dry plating is that in order to form a metal layer having a visible light reflectance of 55% to 90%, preferably 70% to 80%, the layer thickness is extremely thin. This is because it needs to be formed. The metal species contained in the first metal layer 7a is not particularly limited. For example, gold, silver, copper, tin, iron, aluminum, chromium, titanium, magnesium, tungsten, cobalt, zinc, manganese, nickel, etc. can do. Use of aluminum is preferable in that the cost can be reduced. The reason why the visible light reflectance of the first metal layer 7a is 55% to 90%, preferably 70% to 80% is less than 55%, and a glossy metallic tone with a little mirror reflection and a specular feeling cannot be obtained. This is because, if it exceeds 90%, the transmitted light of the first metal layer 7a is small and the reflected light of the second metal layer 7c is small, so that the iris color is hardly expressed. Moreover, it is because an iris color is strongly expressed in the range of 70% to 80%.

  The second metal layer 7c is a metal layer having a visible light reflectance of 55% to 100%, preferably 85% or more. The second metal layer 7c is dry plating such as vacuum deposition, ion plating, sputtering, or electroless or electrolytic plating. It is a layer obtained by applying wet plating such as, or applying ink or paint containing metal powder. The metal species contained in the second metal layer 7c can be the same metal as the metal that is to be contained in the first metal layer 7a. The reason why the visible light reflectance of the second metal layer 7c is 55% to 100%, preferably 80% or more is that if it is less than 55%, the reflected light is small and the iris color is difficult to be expressed. This is because the iris color is strongly expressed in the above range.

  The transparent resin layer 7b is a highly transparent resin layer that is between the first metal layer 7a and the second metal layer 7c and efficiently transmits visible light. Therefore, although it is preferably a completely transparent layer, it is necessary that the layer has a transparency of at least 70% in terms of visible light transmittance. The transparent resin layer 7b is made of various hard resins such as ester, urethane, vinyl acetate, acrylic, carbonate, olefin, and silicone, and among these resins, if a thermoplastic resin is used, It is preferable in that the first metal layer 7a and the second metal layer 7c can also serve as an adhesive layer, and the first metal layer 7a and the second metal layer 7c can be heated and laminated using the transparent resin layer 7b. . The reason why the thickness of the transparent resin layer 7b is 2400 nm to 4800 nm is that if it is less than 2400 nm, it is difficult to express the iris color, and if it exceeds 4800 nm, the light interference is weakened because the interference of light interference is expressed. It is because it becomes difficult to express.

  The decorative layer 7 is formed twice by using a transfer paper having a transfer layer in which the first metal layer 7a is sandwiched between resin layers and a transfer paper having a transfer layer in which the second metal layer 7c is sandwiched between resin layers. It can be obtained by transferring to the key top body 5 over a period of time.

  Further layers may be laminated between the layers, such as between the display layer 6 and the decoration layer 7 or between the decoration layer 7 and the adhesive 4a. However, since the layer provided on the side visually recognized from the decorative layer 7 needs to reach visible light in the decorative layer 7, it needs to be a highly transparent layer. The key top 2 having the layer structure as described above is a key top having a metallic color tone having both a specular feeling and an iris color.

  In general, visible light, which is an aggregate of light having a wavelength between 780 nm and 380 nm, seems to be colorless. Yellow color is felt at 590 nm to 570 nm, green color at 570 nm to 500 nm, blue color at 500 nm to 450 nm, and purple color at 450 nm to 400 nm. The reason why the decorative molded body of the present invention expresses an iris color while having a specular glossy metallic tone is not clear, but is considered as follows. As shown in FIG. 3, when the light incident on the decoration layer 7 having a predetermined layer configuration and reflected is viewed, for example, the light a passes through the first metal layer 7a and is refracted to be a transparent resin layer. 7b is transmitted. Then, the light is reflected by the second metal layer 7c, refracted after passing through the transparent resin layer 7b, and further visible through the first metal layer 7a. On the other hand, the light b is visually reflected by the first metal layer 7a. At this time, a phase difference corresponding to the layer thickness t of the transparent resin layer 7b is generated between the light a and the light b. Therefore, it seems that the iris color is felt by the viewer. Furthermore, since the amount of light reflected by the first metal layer 7a is large, a mirror feeling is also felt. In addition, the appearing iris color appears to have a slightly different color tone depending on the viewing angle of the viewer who mainly views a specific color, but the color tone also appears to change depending on the viewing angle. It is thought to be caused.

  As a modification of the first embodiment, the decoration layer 7 is provided on the surface 5b of the key top body 5, or a part of the decoration layer 7 is removed, and a portion where the decoration layer 7 is not provided is displayed on the display unit 6a. The layer structure may be as follows. In short, the predetermined decorative layer 7 is formed, and at least a configuration in which visible light reaches the decorative layer 7 from the side to be visually recognized may be provided.

Second Embodiment : In the first embodiment, the key top 2 has been described as a decorative molded body, but as an example other than the key top 2, liquid crystal such as a mobile phone 1, a portable information terminal, an AV device, and an automobile device is used. The decorative molded body of the present invention can be applied to a panel cover that protects a screen or the like. By providing the decorative layer 7 at the edge of the panel cover, which is a transparent molded body, it is possible to obtain a unique product in which a decoration with excellent design is added to the corner of a functional liquid crystal screen.

  As described above, the present invention is applied to the key top 2 and the panel cover. However, other than that, the housing made of resin, which is an outer frame of the electronic device, or the like, is made of resin, glass, or other materials, and is external to the device. It can be applied to various molded products that appear in the design.

  Hereinafter, the present invention will be described in more detail based on examples.

Example 1 [FIG. 4] ; As shown in FIG. 4, the key top 2 which is a decorative molded body of Example 1 has a character layer 6b and a cut character layer on the back surface 5a of the key top body 5 made of polycarbonate resin. A first metal layer 7a made of aluminum obtained by dry plating having a visible light reflectance of 75% to 80%, a transparent resin layer 7b having a layer thickness of 4800 nm, The decorative layer 7 is laminated in the order of a second metal layer 7c made of aluminum obtained by dry plating having a visible light reflectance of 94% to 97%, and further has a laminated structure including other layers.

  The visible light reflectance was calculated from the following formula based on the visible light transmittance measured using an ultraviolet-visible spectrophotometer (“UV-1600” manufactured by Shimadzu Corporation) (the visible light absorption rate is ignored). To do).

  Visible light reflectance (%) = 100-Visible light transmittance (%)

  The key top 2 was manufactured according to the following steps. First, a polycarbonate key resin body 5 was formed by injection molding polycarbonate resin. Next, black characters are printed on the back surface 5a of the key top body 5 by screen printing to form the character layer 6b, and the entire back surface 5a of the key top body 5 is filled so as to fill the irregularities formed by the formation of the character layer 6b. A colorless and transparent blank character layer 6c was screen-printed to form a display layer 6 including a display portion 6a representing characters, symbols, and the like (FIG. 5).

  On the other hand, a first protective layer 8b made of an ester-based resin having a layer thickness of 3300 nm is formed on the first release film 8a, and a vacuum deposition treatment is performed on the first protective layer 8b so that a visible light reflectance of 75% to A first metal layer 7a made of 80% aluminum was formed, and further a first adhesive layer 8c made of a polyvinyl acetate resin having a layer thickness of 1500 nm was formed to obtain a first transfer paper 8 (FIG. 6). ).

  Further, a second protective layer 9b made of an ester-based resin having a layer thickness of 2200 nm is formed on the second release film 9a, and a vacuum deposition treatment is performed on the second protective layer 9b to make a visible light reflectance of 94% to 94%. A second metal layer 7c made of 97% aluminum is formed, and a second adhesive layer 9c made of an ester resin having a layer thickness of 1500 nm is formed on the second metal layer 7c to obtain a second transfer paper 9. (FIG. 7).

  Then, the back surface of the display layer 6 is subjected to thermal transfer by applying the first adhesive layer 8c side of the first transfer paper 8, and the first protective layer 8b, the first metal layer 7a, the first adhesive layer, which should also be referred to as the first transfer layer. The layer composed of 8c is transferred to the key top body 5 side (FIG. 8), and further, the second transfer paper 9 is applied to the second adhesive layer 9c side for thermal transfer, and second protection to be referred to as the second transfer layer. The layer composed of the layer 9b, the second metal layer 7c, and the second adhesive layer 9c was moved to the key top body 5 side (not shown) to form the decorative layer 7. At this time, the first protective layer 8b having a layer thickness of 3300 nm and the second adhesive layer 9c having a layer thickness of 1500 nm were laminated to form a transparent resin layer 7b having a layer thickness of 4800 nm. Thus, the key top 2 which is the decorative molded body of this invention was obtained (FIG. 4).

  Further, the key top 2 was bonded to the base sheet 4 made of silicone rubber with an ultraviolet curable translucent adhesive 4 a to obtain a key sheet 3.

  In the key top 2 of Example 1, the first metal layer 7a having a visible light reflectance of 75% to 80% and the second metal layer 7c having a visible light reflectance of 94% to 97% are stacked at an interval of 4800 nm. Thus, a decorative layer 7 having both a glossy metallic tone with a specular feeling and an iris color mainly composed of red could be formed. By laminating the decorative layer 7 on the display layer 6, the key is a metallic design that has a black character portion and a mirror-like metallic luster tone and an iris color mainly composed of red. The top 2 could be obtained.

Example 2 [FIG. 9] ; The key top 2 of Example 1 forms the display part 6a with the character layer 6b by black ink, and forms the display layer 6 with the extraction character layer 6c by colorless and transparent ink. The decorative layer 7 different from this was further laminated. However, in the key top 22, which is the decorative molded body of Example 2, the decorative layer 7 forms the display layer 6 as shown in FIG. That is, there is no printed layer as the blank character layer 6c, and the point that the decorative layer 7 is the blank character layer 6c is significantly different from the key top 2 of the first embodiment.

  That is, the key top 22 of Example 2 is a first metal layer made of aluminum obtained by dry plating with a visible light reflectance of 75% to 80% on a part of the back surface 5a of the key top body 5 made of polycarbonate resin. 7a, a transparent resin layer 7b having a layer thickness of 2800 nm, a second metal layer 7c made of aluminum obtained by dry plating with a visible light reflectance of 98% to 99%, and a decorative layer 7 laminated in this order are provided. And a portion where the decorative layer 7 is not provided on the back surface 5a of the key top main body 5, and a portion including the decorative layer 7 forms a character layer 6c.

  The key top 22 was manufactured according to the following steps. First, a polycarbonate key resin body 5 was formed by injection molding polycarbonate resin.

  On the other hand, a first protective layer 8b made of an ester resin having a layer thickness of 1300 nm is formed on the first release film 8a, and a vacuum deposition treatment is performed on the first protective layer 8b, so that a visible light reflectance of 75% to A first transfer paper 8 was obtained by forming a first metal layer 7 a made of 80% aluminum and further forming a first adhesive layer 8 c made of a polyvinyl acetate resin having a layer thickness of 1500 nm.

  Further, a second protective layer 9b made of an ester-based resin having a layer thickness of 2200 nm is formed on the second release film 9a, and a vacuum deposition treatment is performed on the second protective layer 9b so that a visible light reflectance of 98% to A second metal layer 7c made of 99% aluminum is formed, and a second adhesive layer 9c made of an ester resin having a layer thickness of 1500 nm is formed on the second metal layer 7c to obtain a second transfer paper 9. It was.

  Then, the back surface 5a of the key top body 5 is thermally transferred by applying the first adhesive layer 8c side of the first transfer paper 8, and similarly, the second adhesive sheet 9c side of the second transfer paper 9 is applied and thermally transferred. A decorative layer 7 was formed. At this time, the first protective layer 8b having a layer thickness of 1300 nm and the second adhesive layer 9c having a layer thickness of 1500 nm were laminated to form a transparent resin layer 7b having a layer thickness of 2800 nm.

  Thereafter, a letter-shaped hole is formed in the decorative layer 7 by laser processing, and white ink mainly composed of a urethane-based resin is applied to the entire back surface of the decorative layer 7 so as to fill the hole. The key top 22 which is the decorative molded body of the present invention was obtained (FIG. 9).

  Further, the key top 22 was bonded to the base sheet 4 made of silicone rubber with an ultraviolet curable translucent adhesive 4 a to obtain a key sheet 23.

  In the key top 22 of Example 2, the first metal layer 7a having a visible light reflectance of 75% to 80% and the second metal layer 7c having a visible light reflectance of 98% to 99% are stacked at an interval of 2800 nm. Thus, a decorative layer 7 having both a glossy metallic tone with a specular feeling and an iris color mainly composed of purple could be formed. In addition, the white ink is filled and applied to the part where the transferred layer is removed, so the character part is white, and the part other than the character part has a metallic glossy tone with a specular feeling and an iris color mainly composed of purple. Key top 22 was obtained.

Example 3 [FIG. 10] ; In the key top 22 in Example 2, the decorative layer 7 is the cut-out character layer 6c, whereas in the key top 32 in Example 3, as shown in FIG. The decoration layer 7 was a character layer 6b. That is, the same material was used except that the thickness of the first protective layer 8b of the first transfer paper 8 was 2300 nm and the visible light reflectance of the first metal layer 7a was 55% to 65%. The transferred layer including the layer 7 was laser processed to form a character-shaped hole, whereas in this example, a blank character-shaped hole was formed. And the hole was filled with white ink and the letter layer 6c was formed. Other than that was carried out similarly to Example 2, and obtained the key top 32 of a present Example.

  In the key top 32 of Example 3, the first metal layer 7a having a visible light reflectance of 55% to 65% and the second metal layer 7c having a visible light reflectance of 85% to 90% are stacked at an interval of 3800 nm. Thus, a decorative layer 7 having both a glossy metallic tone with a specular feeling and an iris color mainly composed of orange could be formed. In addition, the key top 32 having a metallic design in which the character portion has a metallic glossy tone having a specular feeling and an iris color mainly composed of an orange color except for the character portion can be obtained.

Example 4 [FIG. 11] ; The key top 22 of Example 2 was subjected to laser processing on the transferred layer including the decorative layer 7 to remove the character portion. The top 42 is greatly different from the key top 22 of the second embodiment in that the second transfer paper 9 is laser processed to previously remove a portion that becomes a character portion and form a display portion.

  That is, as shown in FIG. 11, the key top 42 of the fourth embodiment is the first made of aluminum obtained by dry plating with a visible light reflectance of 55% to 65% on the back surface 5 a of the key top body 5 made of polycarbonate resin. The decoration which consists of the structure laminated | stacked in order of the one metal layer 7a, the transparent resin layer 7b whose layer thickness is 3500 nm, and the 2nd metal layer 7c which consists of aluminum obtained by dry plating whose visible light reflectance is 94%-97%. Since the layer 7 is not provided and the second metal layer 7c is not provided, the decorative layer 7 is not formed.

  The key top 42 was manufactured according to the following steps. First, a polycarbonate key resin body 5 was formed by injection molding polycarbonate resin.

  On the other hand, a first protective layer 8b made of an ester-based resin having a layer thickness of 2000 nm is formed on the first release film 8a, and a vacuum deposition treatment is performed on the first protective layer 8b so that the visible light reflectance 55% to A first metal layer 7a made of 65% aluminum was formed, and further a first adhesive layer 8c made of a polyvinyl acetate resin having a layer thickness of 1500 nm was formed to obtain a first transfer paper 8.

  Further, a second protective layer 9b made of an ester-based resin having a layer thickness of 2200 nm is formed on the second release film 9a, and a vacuum deposition treatment is performed on the second protective layer 9b to make a visible light reflectance of 94% to 94%. A second metal layer 7c made of 97% aluminum is formed, and a second adhesive layer 9c made of an ester resin having a layer thickness of 1500 nm is formed on the second metal layer 7c to obtain a second transfer paper 9. It was.

  The obtained second transfer paper 9 was subjected to laser processing on a part of its surface, and the layers such as the second metal layer 7c were removed to form character-shaped holes P (FIG. 12). Then, the first metal layer 7a side of the first transfer paper 8 is applied to the back surface 5a of the key top body 5 and thermally transferred. Similarly, the second adhesive layer 9c side of the second transfer paper 9 from which the character portion has been removed. And the decorative layer 7 was formed on the extracted character portion. When transferring the second transfer paper 9, care was taken that the hole P formed in the second transfer paper 9 was in the center of the back surface 5 a of the key top body 5. In the blank portion, the first protective layer 8b having a layer thickness of 2000 nm and the second adhesive layer 9c having a layer thickness of 1500 nm were laminated to form a transparent resin layer 7b having a layer thickness of 3500 nm.

  Thereafter, a white ink mainly composed of a urethane resin is applied so as to fill the portion of the hole P where the decorative layer 7 is not formed to form the character layer 6b, and the key which is the decorative molded body of the present invention The top 42 was obtained (FIG. 11).

  Further, the key top 42 was adhered to the base sheet 4 made of silicone rubber with an ultraviolet curable translucent adhesive 4 a to obtain a key sheet 43.

  In the key top 42 of Example 4, the first metal layer 7a having a visible light reflectance of 55% to 65% and the second metal layer 7c having a visible light reflectance of 94% to 97% are stacked at an interval of 3500 nm. Thus, a decorative layer 7 having both a glossy metallic tone with a specular feeling and an iris color mainly composed of green was formed. In addition, by applying white ink to the portion of the hole P (display portion 6a) where the second transfer paper 8 has not been transferred, the glossy metal having a mirror-like character with silver characters on the first metal layer 7a and the white ink. Toned. In addition to the character portion, the metallic tone color has a specular metallic glossy tone and an iris color mainly composed of green.

Example 5 [FIG. 13] ; As shown in FIG. 13, the key top 52, which is a decorative molded body of Example 5, is visible on the surface 5b of the key top body 5 made of acrylonitrile butadiene styrene (ABS) resin. Second metal layer 7c made of nickel and chromium obtained by wet plating with a reflectance of 100%, transparent resin layer 7b with a layer thickness of 3500 nm, and aluminum obtained by dry plating with a visible light reflectance of 88% to 90% It has the structure which has the decoration layer 7 which consists of the structure laminated | stacked in order of the 1st metal layer 7a which becomes.

  In manufacturing the key top 52, first, the key top main body 5 was formed by injection molding of ABS resin. Then, a nickel layer is formed on the surface 5b of the key top main body 5 by electroless plating, and then a chromium layer is formed by electrolytic plating, and the wet plating of nickel and chromium having a visible light reflectance of 100% is performed. A second metal layer 7c was formed (FIG. 14).

  On the other hand, a third protective layer 10b made of an ester-based resin having a layer thickness of 2000 nm is formed on the third release film 10a, and vacuum deposition treatment is performed on the third protective layer 10b so that the visible light reflectance is 88% to A first metal layer 7a made of 90% aluminum was formed. Further, a transparent resin layer 7b made of an acrylic resin having a layer thickness of 3500 nm was formed on the first metal layer 7a to obtain a third transfer paper 10 (FIG. 15).

  Then, heat transfer was performed by applying the transparent resin layer 7 b side of the third transfer paper 10 onto the second metal layer 7 c provided on the key top body 5. Thereby, the transparent resin layer 7b, the 1st metal layer 7a, and the 3rd protective layer 10b were transcribe | transferred from the 3rd peeling film 10a to the 2nd metal layer 7c side, and the key top 52 of this invention was obtained (FIG. 13).

  Further, the key top 52 was bonded to the base sheet 4 made of silicone rubber with an ultraviolet curable translucent adhesive 4 a to obtain a key sheet 53.

  In the key top 52 of Example 5, the first metal layer 7a having a visible light reflectance of 88% to 90% and the second metal layer 7c having a visible light reflectance of 100% are stacked at an interval of 3500 nm to provide a mirror finish. A decorative layer 7 having both a glossy metallic tone and an iris color mainly composed of green was formed. Further, by providing the decoration layer 7 on the surface 5b of the key top body 5, it is possible to obtain a key top 52 having a metallic design having both a metallic glossy tone with a specular feeling and an iris color mainly composed of green. did it.

Example 6, Comparative Examples 1 to 5 ; Compared to the key top 52 of Example 5, except that a decorative layer in which the layer thickness and visible light reflectance of each layer constituting the decorative layer 7 was changed was provided. Produced the key tops of Example 6 and Comparative Examples 1 to 5 having the same layer structure as the key top 52 of Example 5. The conditions for the decorative layer in each of these examples are shown in Table 1 below.

  In the key top 52 of Example 6, the entire surface is a key top with a metallic design having both a metallic glossy tone with a specular feeling and an iris color mainly composed of orange. In the key top of 5, no iris color was developed. Further, with the key top of Comparative Example 3, a metallic luster with a mirror finish could not be obtained.

Example 7 [FIG. 16] ; A key top 72 as a decorative molded body of Example 7 as shown in FIG. 16 was produced. The key top 72 has a decoration layer 7 inside the key top body 5. The key top 72 was manufactured as follows. First, the display layer 6 and the decoration layer 7 were formed on the upper key top body 5c in the same manner as in Example 1. The obtained decorative molded body was further put into a mold for molding the lower key top main body 5d, and a molten resin to be the lower key top main body 5c was injected to be integrated with the decorative molded body. The material used was the same material as that used in the key top 2 of Example 1. The key top 72 thus obtained had a metallic color tone in which the character portion was black and the portion other than the character portion had both a metallic glossy tone having a specular feeling and an iris color mainly composed of red.

  Note that the visible light reflectance was measured by the same method as in Example 1 in any example.

The top view of the key sheet | seat which has the key top of this invention. FIG. 3 is a sectional view taken along line SA-SA in FIG. 1. The schematic diagram which shows progress of the light in a decoration layer. FIG. 2 is a cross-sectional view and a partially enlarged cross-sectional view of a key top according to a first embodiment of the present invention. FIG. 4 is a cross-sectional view and a partially enlarged cross-sectional view of the key top showing a state in which a display layer is formed in the manufacturing process of the key top according to the first embodiment. Sectional drawing and enlarged sectional view of the first transfer paper. Sectional drawing and enlarged sectional view of the second transfer paper. FIG. 6 is a cross-sectional view and an enlarged cross-sectional view of the key top showing a state where the first transfer paper is transferred in the manufacturing process of the key top according to the first embodiment. Sectional drawing and the partially expanded sectional view of the key top by another embodiment of this invention. The sectional view and the partially expanded sectional view of the key top by another embodiment of the present invention. The sectional view and partial expanded sectional view of the key top by another embodiment of the present invention. FIG. 11 is a cross-sectional view and an enlarged cross-sectional view of the second transfer paper showing a state where a part of the second transfer paper is removed in the manufacturing process of the key top shown in FIG. 10. FIG. 10 is a cross-sectional view and a partially enlarged cross-sectional view of a key top according to still another embodiment of the present invention. FIG. 14 is a cross-sectional view and a partially enlarged cross-sectional view of the key top showing a state in which the second metal layer is formed in the manufacturing process of the key top of FIG. 13. Sectional drawing and expanded sectional view of a 3rd transfer paper. The sectional view and partial expanded sectional view of the key top by another embodiment of the present invention. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Mobile phone 1a Case 2,22,32,42,52,72 Key top for pushbutton switch
3 Key sheet 4 Base sheet 4a Adhesive 5 Key top body 5a Back surface of key top body 5b Front surface of key top body 5c Upper key top body 5d Lower key top body 6 Display layer 6a Display section 6b Character layer 6c Extracted character layer 7 Decorative layer 7a First metal layer 7b Transparent resin layer 7c Second metal layer 8 First transfer paper 8a First release film 8b First protective layer 8c First adhesive layer 9 Second transfer paper 9a Second release film 9b Second protective layer 9c Second adhesive layer
10 Third transfer paper
10a Third release film
10b Third protective layer

Claims (10)

  From the side to be viewed, a first metal layer having a visible light reflectance of 55% to 90%, a transparent resin layer having a layer thickness of 2400 nm to 4800 nm, and a second metal layer having a visible light reflectance of 55% to 100% in this order. A decorative molded body comprising a decorative layer laminated on a molded body.   The decorative molded body according to claim 1, wherein the decorative layer is formed on the surface of the molded body.   The decorative molded body according to claim 1, wherein the decorative layer is formed on the back surface or inside of the transparent molded body.   The decorative molded body according to any one of claims 1 to 3, wherein a display layer forming a display unit for displaying characters, symbols, and the like is formed as a layer separate from the decorative layer.   The process according to any one of claims 1 to 4, wherein a display part for displaying characters or symbols is formed at a part where the decorative layer is provided or a part where the decorative layer is not provided. Decorative molded body.   The decorative molded body according to any one of claims 1 to 5, further comprising a transparent resin layer made of a thermoplastic resin.   The decorative molded body according to any one of claims 1 to 6, wherein the molded body is a key top for a pushbutton switch.   A first transfer layer in which a first metal layer having a visible light reflectance of 55% to 90% is sandwiched between resin layers is transferred to the back surface of the transparent molded body, and the visible light reflectance is 55% to A second transfer layer comprising a 100% second metal layer sandwiched between resin layers was transferred to form a transparent resin layer having a layer thickness of 2400 nm to 4800 nm between the first metal layer and the second metal layer. The manufacturing method of the decoration molded object which provided the decoration layer which consists of a 1st metal layer, a transparent resin layer, and a 2nd metal layer characterized by the above-mentioned.   A second transfer layer in which a second metal layer having a visible light reflectance of 55% to 100% is sandwiched between resin layers is transferred to the surface of the molded body, and the visible light reflectance is 55% to 90%. The first transfer layer formed by sandwiching the first metal layer with the resin layer was transferred to form a transparent resin layer having a layer thickness of 2400 nm to 4800 nm between the first metal layer and the second metal layer. A method for producing a decorative molded body provided with a decorative layer comprising a first metal layer, a transparent resin layer, and a second metal layer. The method for producing a decorative molded body according to claim 8 or 9, wherein the molded body is a key top for a pushbutton switch.

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